冰层空气反循环连续取心钻具结构设计与冰心卡断数值模拟  

Structure Design and Ice Core Breaking Simulation of Continual Air-reverse-circulation Ice Coring Drill

作　　者：陈宝义[1] 范大友 王如生[1,2] Pavel Talalay 陈艳吉 CHEN Bao-yi;FAN Da-you;WANG Ru-skeng;Pawel Talalay;CHEN Yan-ji(i.College of Construction Engineer ing,Jilin University,Changchun Jilin 130026,China;Polar Research Center,Jilin University,Changchun Jilin 130026,China)

机构地区：[1]吉林大学建设工程学院,吉林长春130026 [2]吉林大学极地研究中心,吉林长春130026

出　　处：《探矿工程（岩土钻掘工程）》2018年第9期46-50,共5页Exploration Engineering:Rock & Soil Drilling and Tunneling

基　　金：国家自然科学基金面上项目"热水钻热流场对钻速及钻孔空间结构影响研究"(编号:41476160)

摘　　要：冰心包含大量的古气候资料和古生物学信息,这些信息对于从远古到现代的气候变化和生物进化都很重要。如何高效快速地获取无污染的冰心是极地科学家的一个重要课题。冰层空气反循环钻具采用双壁钻杆形成反循环通道,内管提供了从钻头底部到表面的冰屑和冰心的连续通道。钻具通过卡断机构卡断冰心,通过反循环通道不断运移冰心,从而实现连续钻具连续取心。本文采用ABAQUS软件对冰心卡断过程进行分析,运用XFEM断裂准则以及Explicit显式方法求解,选出适宜的卡断器尺寸和中心通道尺寸,从而得到更好的反循环钻进效果。Ice cores contain vast amounts of paleoclimate and paleontological information. These are important for climate change and biological evoIution from ancient times to modern times. How to acquire clean ice cores efficiently and quickly is an important issue for polar scientists.The continual air- reverse- circulation ice coring drill use a double wall drill pipe to form a reverse circulation channel. The inner pipe provides a continuous channel for transporting the ice chips and cores from the bottom of the hole to the ice sheet surface. The drill can break the ice core by its breaker, and move the ice core continuously through the reverse circulation channel, so as to realize the continual coring. By using ABAQUS software, this paper analyzes the process of ice core breaking, use of XFEM fracture cri terion and Explicit method, choose appropriatc breaker size and center channel size, so as to get better effect of re verse circulation drilling.

关 键 词：冰钻 结构设计 数值模拟 冰心卡断 反循环 

分 类 号：P634[天文地球—地质矿产勘探]